<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/147395>147395</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [DirectX] `llvm.lifetime.start/.end` intrinsics are not properly encoded in DXIL bitcode
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          Icohedron
      </td>
    </tr>
</table>

<pre>
    DXIL bitcode containing `llvm.lifetime.start/end` intrinsics emitted by Clang currently fail to validate under the DXIL validator (dxv). The encoding should be fixed to allow the validator and dxil-dis to read them properly.

Sample shader that Clang emits lifetime intrinsics for
```hlsl
uint2 Foo(uint2 a[2], uint i) {
  return a[i];
}
cbuffer Constants {
  uint2 arr[2];
}
RWStructuredBuffer<uint> output;
[numthreads(1, 1, 1)]
void CSMain(uint3 Tid : SV_DispatchThreadID) {
  output[0] = Foo(arr, Tid.x).x;
}
```
https://godbolt.org/z/haz47M8fz
</pre>
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